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A single injection of alpha beta-interferon (alpha beta-IFN) (30000 units/mouse), a major biological modifier of natural killer (NK) cytolytic activity, strongly stimulated NK activity in normal mice, as expected, while the same treatment did not statistically alter the NK response in cyclophosphamide (CY)-suppressed animals. We investigated the possibility of thymosin alpha 1 cooperating with alpha beta-IFN in boosting NK activity in CY-suppressed animals. The results show that treatment with thymosin alpha 1 (200 micrograms/kg) for 4 days, followed by a single injection of alpha beta-IFN 24 h before testing, strongly restored NK activity in CY-suppressed mice. Thymosin alpha 1 was, moreover, able to accelerate the recovery rate of NK activity in bone marrow reconstituted murine chimeras. Taken together the data support the concept that the synergic effect between thymosin alpha 1 and alpha beta-IFN could be the result of effects on differentiation of the NK lineage at different levels.
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